Image Caption: STS49-87-065: Arabian Sea: Ship Wakes and Oil Slicks The pas-sage of a ship as it dumped its bilges of oil into the ArabianSea is seen as a bright line in this view of the sunglint pat-tern. Such man-made oil slicks can serve to illustrate the rela-tive movement of surface waters. At the bottom of the frame, theslick shows where the ship passed a front, where sheer betweenthe two water masses has distorted the oil slick.